For our Geo Quiz we were looking for the countries where you'd find the Mapuche, an indigenous people. The answers are Chile and Argentina. Mapuche protesters joined crowds along the streets of Santiago yesterday to protest the celebration of Columbus Day. The World's David Leveille reports.

We were looking for a tributary of the Amazon that starts in the Brazilian state of Mato Grosso. The answer is the Xingu River. Researchers working near the source of the river have un-covered traces of ancient settlements -- known as "lost cities" -- buried under a thick layer of jungle. Lisa Mullins speaks with Michael Heckenberger, a professor of Anthropology at the University of Florida who led an expedition to the region.

The World's Matthew Bell reports that foreign policy issues are on the table as Hillary Clinton and Barack Obama look for a win in tomorrow's big primaries in Texas and Ohio; during campaign stops in Ohio

When Evanna Hu and her family came to the US, they were poor. She just didn’t know it because she was surrounded by other low-income immigrant families in Columbus, Ohio. Here's the story of her first days in America.

Annu Palakunnathu Matthew's has focused her photography on twisting perceptions of immigration and identity in America. Her new project, called "Majority Minority," looks at the changes across generations of immigrant families.

Some school districts in New Mexico have been educating students from across the Mexican border for decades. These kids are US citizens living in Mexico. But some critics say the practice should stop because of the expense and because of the drug war.

Since the population of the island we want you to name was mostly evacuated or relocated to the northern region there has been an ongoing process of re-establishing a national identity. And that includes finding a national anthem. Can you name the island?

Some 400 Palomas, Mexico, residents cross the border into New Mexico every day to go to school. These kids, all American citizens, are choosing to get an education in the U.S., rather than Mexico. But the border crossing comes with a price.